x402basequality 0.25

Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/inbox/31

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/inbox/31` is listed as "Premium API Access" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each POST request.

The platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02 per-request pricing. The x402 challenge was successfully captured with version 1 of the protocol, confirming the endpoint is live.

Note that the specific endpoint being listed here (`/api/v1/inbox/31`) does not correspond to any of the named endpoints on the landing page, and no documentation, OpenAPI schema, or example payloads are available for it. Its actual functionality is unknown beyond the generic "Premium API Access" label. Callers should treat this as an opaque POST endpoint until further documentation is provided.

Capabilities

x402-paymentusdc-basepay-per-requestpost-endpointno-api-keyno-rate-limit

Use cases

  • —Programmatic access to an undocumented premium endpoint via x402 micropayment
  • —Agent-driven API consumption without pre-registration or API keys
  • —Exploring a multi-category API catalog (data, AI, finance, utilities) with per-call USDC settlement

Fit

Best for

  • —Developers or agents wanting zero-signup, pay-as-you-go API access
  • —x402-compatible agents that can settle USDC on Base
  • —Low-volume or experimental use cases where $0.02/call is acceptable

Not for

  • —Users who need detailed documentation or guaranteed SLAs before calling
  • —High-volume production workloads where per-call crypto settlement adds overhead
  • —Anyone needing to understand the exact input/output schema before paying

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/inbox/31 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/inbox/31
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.25/ 1.00

The x402 challenge is live and confirms pricing, but the specific endpoint /api/v1/inbox/31 has no documentation, no OpenAPI schema, no example request/response, and its purpose ('Premium API Access') is entirely generic. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful content.

Warnings

  • —Endpoint /api/v1/inbox/31 does not match any named endpoint on the provider's landing page — its actual functionality is unknown.
  • —No OpenAPI spec, input schema, or output schema is available for this endpoint.
  • —No example requests or responses are documented anywhere in the crawled material.
  • —The /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet').

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:22:41Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/mDZDm9
Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart